SIENTIAPDE-1084

Remove deprecated files and enhance documentation

- Deleted `coverage.sh`, `docker-compose.yaml`, `Dockerfile`, and simulator-related files to streamline the project structure.
- Updated `README.md` to provide a comprehensive overview of the OPC Ingestor, including features, architecture, installation, usage, and troubleshooting.
- Enhanced docstrings across various classes and methods in the `ingestor` module for better clarity and maintainability.
- Improved Prometheus metrics documentation in `metrics.py` to ensure proper monitoring and observability of the system.

.env.example

@@ -0,0 +1,21 @@
+# Kafka
+KAFKA_SERVERS="localhost:9092"
+EXPORT_TO_KAFKA="false"
+
+# Redis
+REDIS_HOST="localhost"
+REDIS_PORT="6379"
+REDIS_USERNAME="redis_user"
+REDIS_PASSWORD="redis_password"
+
+# Pod
+HOSTNAME="localhost"
+POLL_INTERVAL="5"
+LOG_LEVEL="DEBUG"
+
+# Mongo DB
+MONGODB_URL="localhost:27018"
+MONGODB_USERNAME="mongo_user"
+MONGODB_PASSWORD="mongo_password"
+MONGODB_DATABASE="sientia"
+